Fluid fuel burner muffler



wwI WILLIAMS Er AL. 2,012,794

FLUID FUEL BURNER MUFFLER Aug. 27, 1935.

Original Filed Dec. 27, 1952 i N11 :i \\\\\I Q Q Illlmh lmln PatentedAug. 27, 1935 UNITED STATES PATENT OFFICE FLUID FUEL BURNER MUFFLERWalter W. Williams, Philip A.

Celander, and

Oliver Earl Neamith, Bloomington, Ill.: said Celander and said Nesmithassignors of their entire right to Williams Oil-O-Matic HeatingCorporation. Bloomington. IIL,

of Illinois a corporation 2 Claims.

This invention relates. to improvements in electrically operated uidfuel burners of the domestic type for installation with heating plantsof homes and buildings, and more particularly to the-construction of anair mumer for use therewith.

It is an object of this invention to reduce the noise of operation inuid fuel burners of this type occasioned by the passage of air from thesurrounding atmosphere into the compression pump. With this object inview, reference is made to the accompanying sheet of drawings whichillustrate a preferred form of this invention with the understandingthat minor detail changes may be made without departing from the scopethereof.

In the drawing:

Figure 1 is a view in side elevation of a commercial type of domesticfluid fuel burner with parts broken away, illustrating the air muiiierin central vertical section.

Figure 2 is an enlarged detail view in similar section of the airmuffler cap.

Figure 3 is a view in side elevation of Figure 2, looking at the leftside thereof.

The embodiment of this invention is illustrated in connection with acommercial type of fluid fuel-burning mechanism for domestic heatingpurposes of the same general type as illustrated in the W. W. WilliamsPatent No. 1,817,051, August 4, 1931. The embodiment illustratedincludes a base I, which supports an integral fan blower casing orhousing 2 having an extension for receiving and mounting the electricmotor 3. The other side of the motor is provided with a cover or an endbell 4 secured to the casing. The motor is provided with a driving shaftl for operating an oil pump and also operating a fan blower. The drivingshaft 5 is extended through the end bell 4 on the side of the motor foroperating a. compression pump 6 and metering pump mounted, not shown,upon the end bell. The general construction and operation of thepressure pump and metering pump is of the type disclosed in the W. W.Williams Patent No. 1,451,798, granted April 17, 1923.

The pressure pump 6 draws atmospheric air into the pump chamber throughan air muiiler, including a casing 1 mounted on the casing upon thepressure pump 6, as shown in Figure 1. The casing 1 is preferablycylindrical in shape with an annular passageway 8 about a concentricbaille 9. The casing 1 is provided with a similar shaped cover I0 and acorresponding annular passageway 8 and corresponding cylindrical baillel. A

flexible diaphragm II is positioned between the contacting surfaces ofthe casing 1 and cover I0, which cover is drawn tightly upon the casingby a plurality of screws I2. This flexible diaphragm is shown in theenlarged detailed view, Figure 3, in which the outline of the casing 1is indicated in dotted lines and likewise the outline of the cylindricalbaiiie 9 is shown in dotted lines. This diaphragm is referably made of atreated heavy exible paper, such as that commercially known as Karrapak,The cover I0 is provided with a central opening I3, which supports anair intake tube I4, which passes through the diaphragm II and opens intothe casing 1, within the cylindrical baille 9. The diaphragm is providedwith a plurality of apertures I5, which allow the air drawn through thetube I4 to pass from the chamber within the baiile 9 through thediaphragm into the corresponding chamber 9 in the cap. The wall of thecylindrical baiile of the cap is provided with one or more apertures I6,opening into the annular passageway iia in the cap and the diaphragm isprovided with a plurality of apertures I1, forming a means ofcommunication between the annular passageways 8a and 8 in the cap andcasing. The annular passageway 8 in the casing is provided with apassageway I8 leading to the intake I9 of the pressure pump, whichpassageway is preferably provided with a ball check valve 2li.

By this construction, when the motor starts the operation of thepressure pump, atmospheric air is drawn through the opening I3 in themuler cap, passes through the tube I4 into the chamber 9b formed by thecylindrical bale 9 and diaphragm I I, passes through the apertures I5 inthe diaphragm into the similar chamber Sic on the other side thereof,then throughthe aperture I6 into the annular passageway 8l about theexterior of the cylindrical baille ila in the cap and then through theapertures I1 in the diaphragm into the annular passageway 8 in thecasing 1 upon the exterior of the cylindrical baffle 9, through thepassageway I8 leading therefrom, lifting the ball check valve 20, andenters the intake I9 of the pump. It has been found that by thisconstruction the atmospheric air is drawn into the pressure pump at a.constant rate, with little or no noise. The diaphragm I I is easily andreadily replaced. The pressure pump rotates at a very high rate of speedand as the diaphragm is of soft, flexible material, the air passingthrough and about it at a high rate of speed is muffled. The check valveis provided to prevent the pump from forcing oil out through the muiilerin the event that the discharge side of the pump, or any of the partsleading therefrom, become clogged or stopped up. The air passes throughthe diaphragm twice on its way to the pump, sets up a vibration in thediaphragm, which, on account of its composition, is noiseless.

This application is a division of the joint application led by Walter W.Williams, Philip A. Celander, and Oliver Earl Nesrnith, Serial Number648,965, filed December 27, 1933, for improvements in Electricallyoperated fluid fuel burners.

What we claim is:

1. A device for muiiling the intake of an air pump including means foradmitting air to said pump and a muler casing about the exterior of saidintake having a perforated flexible diaphragm and a plurality of baiilesarranged to cooperate with the perforations of the diaphragm to pass theair drawn into the pump back and forth through the flexible diaphragm.

f 2. Adevice for muiliing the intake of an air pump including a casingabout said pump provided with an air intake passage, a muiiler mountedupon said pump casing communicating with said intake passage comprisinga cylindrical muler casing having a concentric baille therein forming anannular passage, a connecting passage provided in the muflier casingfrom the said annular passage to the said pump intake passage, a checkvalve in said muler casing passage permitting air to pass therethroughto said pump, a cap secured over said muiller casing having aregistering concentric baile and an axially disposed passagetherethrough with a iiexible diaphragm secured between the contactingparts of the said cap and muiiier casing and engaged by the saidoppositely disposed similar concentric bailles, said cap having anaxially disposed passage therethrough and supporting on the interior aconcentric intake tube passing through said diaphragm, said diaphragmprovided with perforations upon the interior and exterior of saidconcentric baiiles and a passage provided in the concentric baiile ofthe said cap opening into the annular passage thereabout, whereby theoperation of the pump draws air through the mufller in a circuitouspath.

WALTER W. WILLIAMS. PHILIP A. CELANDER. OLIVER EARL NESMITH.

